diff --git a/artifacts.go b/artifacts.go
index c9dd0b9d3..08841f93a 100644
--- a/artifacts.go
+++ b/artifacts.go
@@ -24,5 +24,5 @@ var CurrentArtifacts = ArtifactSet{
 	Debs: []DebianPackage{
 		{Name: "etcdpasswd", Owner: "cybozu-go", Repository: "etcdpasswd", Release: "v1.4.9"},
 	},
-	OSImage: OSImage{Channel: "stable", Version: "4081.2.0"},
+	OSImage: OSImage{Channel: "stable", Version: "3975.2.2"},
 }
diff --git a/artifacts_ignore.yaml b/artifacts_ignore.yaml
index 7f6aca5ad..3456f5ace 100644
--- a/artifacts_ignore.yaml
+++ b/artifacts_ignore.yaml
@@ -5,3 +5,6 @@ images:
   versions: ["6.12.0.1"]
 - repository: ghcr.io/cybozu/squid-exporter
   versions: ["1.0.7"]
+osImage:
+- channel: stable
+  versions: ["4081.2.0"]